14215700-IG, Edition 15.0
May 2020, Original document
161
Using Multicast Signaling for Paging
If having more than 256 base stations connected on a site, default paging is not enough due to the
amount of base stations. In this situation, if multicast signaling is supported, multicast is the preferred
paging method. For selecting multicast signaling as paging method, see
.
Optionally, you can create sites when using multicast signaling as well, e.g. if local media resources
are needed (assuming no high traffic load).
l
Multicast for more than 256 Spectralink IP-DECT Base Stations on a site is routable and con-
figurable.
l
TTL is default set to 1 but can be changed according to network topology.
l
The multicast IP address is configurable, default value is 239.255.1.11
Note:
The multicast implementation for more than 256 Spectralink IP-DECT Base Stations on
a site is designed for the scalability of large networks. Though multicast is the preferred
paging method when using more than 256 Spectralink IP-DECT Base Stations on a site,
it is also possible to use it on fewer Spectralink IP-DECT Base Stations.
A Spectralink IP-DECT Server 6500/Spectralink Virtual IP-DECT Server One with more
than 256 Spectralink IP-DECT Base Stations does not always need to use Multicast sig-
naling. Multicast signaling can be a problem in some WAN configurations.
When a Spectralink IP-DECT Base Station is connected to a switch port, it will announce itself by
IGMPv3 (Internet Group Management Protocol). The Spectralink IP-DECT Base Station will then
send a Membership report/Join group.
Note:
When using IGMP snooping for managing the multicast traffic in the network infra-
structure, it may be required to have an IGMP querier running on the network for proper
multicast operation. Please consult the network equipment documentation for more
information.
Every 60 second, the Spectralink IP-DECT/Virtual IP-DECT Server will send a keep alive signal IP-
DECT Server -> 239.255.1.11:56001
If the system is redundant, the keep alive will be sent from the backup Spectralink IP-DECT/Virtual
IP-DECT Server as well.
Spectralink IP-DECT Server 200/400/6500 and Virtual IP-DECT Server One Installation and Configuration Guide